yading@10: /*
yading@10:  * Copyright (c) 2013 Clément Bœsch
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/bprint.h"
yading@10: #include "libavutil/eval.h"
yading@10: #include "libavutil/file.h"
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "libavutil/avassert.h"
yading@10: #include "avfilter.h"
yading@10: #include "formats.h"
yading@10: #include "internal.h"
yading@10: #include "video.h"
yading@10: 
yading@10: struct keypoint {
yading@10:     double x, y;
yading@10:     struct keypoint *next;
yading@10: };
yading@10: 
yading@10: #define NB_COMP 3
yading@10: 
yading@10: enum preset {
yading@10:     PRESET_NONE,
yading@10:     PRESET_COLOR_NEGATIVE,
yading@10:     PRESET_CROSS_PROCESS,
yading@10:     PRESET_DARKER,
yading@10:     PRESET_INCREASE_CONTRAST,
yading@10:     PRESET_LIGHTER,
yading@10:     PRESET_LINEAR_CONTRAST,
yading@10:     PRESET_MEDIUM_CONTRAST,
yading@10:     PRESET_NEGATIVE,
yading@10:     PRESET_STRONG_CONTRAST,
yading@10:     PRESET_VINTAGE,
yading@10:     NB_PRESETS,
yading@10: };
yading@10: 
yading@10: typedef struct {
yading@10:     const AVClass *class;
yading@10:     enum preset preset;
yading@10:     char *comp_points_str[NB_COMP + 1];
yading@10:     char *comp_points_str_all;
yading@10:     uint8_t graph[NB_COMP + 1][256];
yading@10:     char *psfile;
yading@10: } CurvesContext;
yading@10: 
yading@10: #define OFFSET(x) offsetof(CurvesContext, x)
yading@10: #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
yading@10: static const AVOption curves_options[] = {
yading@10:     { "preset", "select a color curves preset", OFFSET(preset), AV_OPT_TYPE_INT, {.i64=PRESET_NONE}, PRESET_NONE, NB_PRESETS-1, FLAGS, "preset_name" },
yading@10:         { "none",               NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NONE},                 INT_MIN, INT_MAX, FLAGS, "preset_name" },
yading@10:         { "color_negative",     NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_COLOR_NEGATIVE},       INT_MIN, INT_MAX, FLAGS, "preset_name" },
yading@10:         { "cross_process",      NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_CROSS_PROCESS},        INT_MIN, INT_MAX, FLAGS, "preset_name" },
yading@10:         { "darker",             NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_DARKER},               INT_MIN, INT_MAX, FLAGS, "preset_name" },
yading@10:         { "increase_contrast",  NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_INCREASE_CONTRAST},    INT_MIN, INT_MAX, FLAGS, "preset_name" },
yading@10:         { "lighter",            NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LIGHTER},              INT_MIN, INT_MAX, FLAGS, "preset_name" },
yading@10:         { "linear_contrast",    NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LINEAR_CONTRAST},      INT_MIN, INT_MAX, FLAGS, "preset_name" },
yading@10:         { "medium_contrast",    NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_MEDIUM_CONTRAST},      INT_MIN, INT_MAX, FLAGS, "preset_name" },
yading@10:         { "negative",           NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NEGATIVE},             INT_MIN, INT_MAX, FLAGS, "preset_name" },
yading@10:         { "strong_contrast",    NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_STRONG_CONTRAST},      INT_MIN, INT_MAX, FLAGS, "preset_name" },
yading@10:         { "vintage",            NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_VINTAGE},              INT_MIN, INT_MAX, FLAGS, "preset_name" },
yading@10:     { "master","set master points coordinates",OFFSET(comp_points_str[NB_COMP]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
yading@10:     { "m",     "set master points coordinates",OFFSET(comp_points_str[NB_COMP]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
yading@10:     { "red",   "set red points coordinates",   OFFSET(comp_points_str[0]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
yading@10:     { "r",     "set red points coordinates",   OFFSET(comp_points_str[0]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
yading@10:     { "green", "set green points coordinates", OFFSET(comp_points_str[1]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
yading@10:     { "g",     "set green points coordinates", OFFSET(comp_points_str[1]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
yading@10:     { "blue",  "set blue points coordinates",  OFFSET(comp_points_str[2]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
yading@10:     { "b",     "set blue points coordinates",  OFFSET(comp_points_str[2]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
yading@10:     { "all",   "set points coordinates for all components", OFFSET(comp_points_str_all), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
yading@10:     { "psfile", "set Photoshop curves file name", OFFSET(psfile), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFILTER_DEFINE_CLASS(curves);
yading@10: 
yading@10: static const struct {
yading@10:     const char *r;
yading@10:     const char *g;
yading@10:     const char *b;
yading@10:     const char *master;
yading@10: } curves_presets[] = {
yading@10:     [PRESET_COLOR_NEGATIVE] = {
yading@10:         "0/1 0.129/1 0.466/0.498 0.725/0 1/0",
yading@10:         "0/1 0.109/1 0.301/0.498 0.517/0 1/0",
yading@10:         "0/1 0.098/1 0.235/0.498 0.423/0 1/0",
yading@10:     },
yading@10:     [PRESET_CROSS_PROCESS] = {
yading@10:         "0.25/0.156 0.501/0.501 0.686/0.745",
yading@10:         "0.25/0.188 0.38/0.501 0.745/0.815 1/0.815",
yading@10:         "0.231/0.094 0.709/0.874",
yading@10:     },
yading@10:     [PRESET_DARKER]             = { .master = "0.5/0.4" },
yading@10:     [PRESET_INCREASE_CONTRAST]  = { .master = "0.149/0.066 0.831/0.905 0.905/0.98" },
yading@10:     [PRESET_LIGHTER]            = { .master = "0.4/0.5" },
yading@10:     [PRESET_LINEAR_CONTRAST]    = { .master = "0.305/0.286 0.694/0.713" },
yading@10:     [PRESET_MEDIUM_CONTRAST]    = { .master = "0.286/0.219 0.639/0.643" },
yading@10:     [PRESET_NEGATIVE]           = { .master = "0/1 1/0" },
yading@10:     [PRESET_STRONG_CONTRAST]    = { .master = "0.301/0.196 0.592/0.6 0.686/0.737" },
yading@10:     [PRESET_VINTAGE] = {
yading@10:         "0/0.11 0.42/0.51 1/0.95",
yading@10:         "0.50/0.48",
yading@10:         "0/0.22 0.49/0.44 1/0.8",
yading@10:     }
yading@10: };
yading@10: 
yading@10: static struct keypoint *make_point(double x, double y, struct keypoint *next)
yading@10: {
yading@10:     struct keypoint *point = av_mallocz(sizeof(*point));
yading@10: 
yading@10:     if (!point)
yading@10:         return NULL;
yading@10:     point->x = x;
yading@10:     point->y = y;
yading@10:     point->next = next;
yading@10:     return point;
yading@10: }
yading@10: 
yading@10: static int parse_points_str(AVFilterContext *ctx, struct keypoint **points, const char *s)
yading@10: {
yading@10:     char *p = (char *)s; // strtod won't alter the string
yading@10:     struct keypoint *last = NULL;
yading@10: 
yading@10:     /* construct a linked list based on the key points string */
yading@10:     while (p && *p) {
yading@10:         struct keypoint *point = make_point(0, 0, NULL);
yading@10:         if (!point)
yading@10:             return AVERROR(ENOMEM);
yading@10:         point->x = av_strtod(p, &p); if (p && *p) p++;
yading@10:         point->y = av_strtod(p, &p); if (p && *p) p++;
yading@10:         if (point->x < 0 || point->x > 1 || point->y < 0 || point->y > 1) {
yading@10:             av_log(ctx, AV_LOG_ERROR, "Invalid key point coordinates (%f;%f), "
yading@10:                    "x and y must be in the [0;1] range.\n", point->x, point->y);
yading@10:             return AVERROR(EINVAL);
yading@10:         }
yading@10:         if (!*points)
yading@10:             *points = point;
yading@10:         if (last) {
yading@10:             if ((int)(last->x * 255) >= (int)(point->x * 255)) {
yading@10:                 av_log(ctx, AV_LOG_ERROR, "Key point coordinates (%f;%f) "
yading@10:                        "and (%f;%f) are too close from each other or not "
yading@10:                        "strictly increasing on the x-axis\n",
yading@10:                        last->x, last->y, point->x, point->y);
yading@10:                 return AVERROR(EINVAL);
yading@10:             }
yading@10:             last->next = point;
yading@10:         }
yading@10:         last = point;
yading@10:     }
yading@10: 
yading@10:     /* auto insert first key point if missing at x=0 */
yading@10:     if (!*points) {
yading@10:         last = make_point(0, 0, NULL);
yading@10:         if (!last)
yading@10:             return AVERROR(ENOMEM);
yading@10:         last->x = last->y = 0;
yading@10:         *points = last;
yading@10:     } else if ((*points)->x != 0.) {
yading@10:         struct keypoint *newfirst = make_point(0, 0, *points);
yading@10:         if (!newfirst)
yading@10:             return AVERROR(ENOMEM);
yading@10:         *points = newfirst;
yading@10:     }
yading@10: 
yading@10:     av_assert0(last);
yading@10: 
yading@10:     /* auto insert last key point if missing at x=1 */
yading@10:     if (last->x != 1.) {
yading@10:         struct keypoint *point = make_point(1, 1, NULL);
yading@10:         if (!point)
yading@10:             return AVERROR(ENOMEM);
yading@10:         last->next = point;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int get_nb_points(const struct keypoint *d)
yading@10: {
yading@10:     int n = 0;
yading@10:     while (d) {
yading@10:         n++;
yading@10:         d = d->next;
yading@10:     }
yading@10:     return n;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Natural cubic spline interpolation
yading@10:  * Finding curves using Cubic Splines notes by Steven Rauch and John Stockie.
yading@10:  * @see http://people.math.sfu.ca/~stockie/teaching/macm316/notes/splines.pdf
yading@10:  */
yading@10: static int interpolate(AVFilterContext *ctx, uint8_t *y, const struct keypoint *points)
yading@10: {
yading@10:     int i, ret = 0;
yading@10:     const struct keypoint *point;
yading@10:     double xprev = 0;
yading@10: 
yading@10:     int n = get_nb_points(points); // number of splines
yading@10: 
yading@10:     double (*matrix)[3] = av_calloc(n, sizeof(*matrix));
yading@10:     double *h = av_malloc((n - 1) * sizeof(*h));
yading@10:     double *r = av_calloc(n, sizeof(*r));
yading@10: 
yading@10:     if (!matrix || !h || !r) {
yading@10:         ret = AVERROR(ENOMEM);
yading@10:         goto end;
yading@10:     }
yading@10: 
yading@10:     /* h(i) = x(i+1) - x(i) */
yading@10:     i = -1;
yading@10:     for (point = points; point; point = point->next) {
yading@10:         if (i != -1)
yading@10:             h[i] = point->x - xprev;
yading@10:         xprev = point->x;
yading@10:         i++;
yading@10:     }
yading@10: 
yading@10:     /* right-side of the polynomials, will be modified to contains the solution */
yading@10:     point = points;
yading@10:     for (i = 1; i < n - 1; i++) {
yading@10:         double yp = point->y,
yading@10:                yc = point->next->y,
yading@10:                yn = point->next->next->y;
yading@10:         r[i] = 6 * ((yn-yc)/h[i] - (yc-yp)/h[i-1]);
yading@10:         point = point->next;
yading@10:     }
yading@10: 
yading@10: #define B 0 /* sub  diagonal (below main) */
yading@10: #define M 1 /* main diagonal (center) */
yading@10: #define A 2 /* sup  diagonal (above main) */
yading@10: 
yading@10:     /* left side of the polynomials into a tridiagonal matrix. */
yading@10:     matrix[0][M] = matrix[n - 1][M] = 1;
yading@10:     for (i = 1; i < n - 1; i++) {
yading@10:         matrix[i][B] = h[i-1];
yading@10:         matrix[i][M] = 2 * (h[i-1] + h[i]);
yading@10:         matrix[i][A] = h[i];
yading@10:     }
yading@10: 
yading@10:     /* tridiagonal solving of the linear system */
yading@10:     for (i = 1; i < n; i++) {
yading@10:         double den = matrix[i][M] - matrix[i][B] * matrix[i-1][A];
yading@10:         double k = den ? 1./den : 1.;
yading@10:         matrix[i][A] *= k;
yading@10:         r[i] = (r[i] - matrix[i][B] * r[i - 1]) * k;
yading@10:     }
yading@10:     for (i = n - 2; i >= 0; i--)
yading@10:         r[i] = r[i] - matrix[i][A] * r[i + 1];
yading@10: 
yading@10:     /* compute the graph with x=[0..255] */
yading@10:     i = 0;
yading@10:     point = points;
yading@10:     av_assert0(point->next); // always at least 2 key points
yading@10:     while (point->next) {
yading@10:         double yc = point->y;
yading@10:         double yn = point->next->y;
yading@10: 
yading@10:         double a = yc;
yading@10:         double b = (yn-yc)/h[i] - h[i]*r[i]/2. - h[i]*(r[i+1]-r[i])/6.;
yading@10:         double c = r[i] / 2.;
yading@10:         double d = (r[i+1] - r[i]) / (6.*h[i]);
yading@10: 
yading@10:         int x;
yading@10:         int x_start = point->x       * 255;
yading@10:         int x_end   = point->next->x * 255;
yading@10: 
yading@10:         av_assert0(x_start >= 0 && x_start <= 255 &&
yading@10:                    x_end   >= 0 && x_end   <= 255);
yading@10: 
yading@10:         for (x = x_start; x <= x_end; x++) {
yading@10:             double xx = (x - x_start) * 1/255.;
yading@10:             double yy = a + b*xx + c*xx*xx + d*xx*xx*xx;
yading@10:             y[x] = av_clipf(yy, 0, 1) * 255;
yading@10:             av_log(ctx, AV_LOG_DEBUG, "f(%f)=%f -> y[%d]=%d\n", xx, yy, x, y[x]);
yading@10:         }
yading@10: 
yading@10:         point = point->next;
yading@10:         i++;
yading@10:     }
yading@10: 
yading@10: end:
yading@10:     av_free(matrix);
yading@10:     av_free(h);
yading@10:     av_free(r);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int parse_psfile(AVFilterContext *ctx, const char *fname)
yading@10: {
yading@10:     CurvesContext *curves = ctx->priv;
yading@10:     uint8_t *buf;
yading@10:     size_t size;
yading@10:     int i, ret, av_unused(version), nb_curves;
yading@10:     AVBPrint ptstr;
yading@10:     static const int comp_ids[] = {3, 0, 1, 2};
yading@10: 
yading@10:     av_bprint_init(&ptstr, 0, AV_BPRINT_SIZE_AUTOMATIC);
yading@10: 
yading@10:     ret = av_file_map(fname, &buf, &size, 0, NULL);
yading@10:     if (ret < 0)
yading@10:         return ret;
yading@10: 
yading@10: #define READ16(dst) do {                \
yading@10:     if (size < 2)                       \
yading@10:         return AVERROR_INVALIDDATA;     \
yading@10:     dst = AV_RB16(buf);                 \
yading@10:     buf  += 2;                          \
yading@10:     size -= 2;                          \
yading@10: } while (0)
yading@10: 
yading@10:     READ16(version);
yading@10:     READ16(nb_curves);
yading@10:     for (i = 0; i < FFMIN(nb_curves, FF_ARRAY_ELEMS(comp_ids)); i++) {
yading@10:         int nb_points, n;
yading@10:         av_bprint_clear(&ptstr);
yading@10:         READ16(nb_points);
yading@10:         for (n = 0; n < nb_points; n++) {
yading@10:             int y, x;
yading@10:             READ16(y);
yading@10:             READ16(x);
yading@10:             av_bprintf(&ptstr, "%f/%f ", x / 255., y / 255.);
yading@10:         }
yading@10:         if (*ptstr.str) {
yading@10:             char **pts = &curves->comp_points_str[comp_ids[i]];
yading@10:             if (!*pts) {
yading@10:                 *pts = av_strdup(ptstr.str);
yading@10:                 av_log(ctx, AV_LOG_DEBUG, "curves %d (intid=%d) [%d points]: [%s]\n",
yading@10:                        i, comp_ids[i], nb_points, *pts);
yading@10:                 if (!*pts) {
yading@10:                     ret = AVERROR(ENOMEM);
yading@10:                     goto end;
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: end:
yading@10:     av_bprint_finalize(&ptstr, NULL);
yading@10:     av_file_unmap(buf, size);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static av_cold int init(AVFilterContext *ctx)
yading@10: {
yading@10:     int i, j, ret;
yading@10:     CurvesContext *curves = ctx->priv;
yading@10:     struct keypoint *comp_points[NB_COMP + 1] = {0};
yading@10:     char **pts = curves->comp_points_str;
yading@10:     const char *allp = curves->comp_points_str_all;
yading@10: 
yading@10:     //if (!allp && curves->preset != PRESET_NONE && curves_presets[curves->preset].all)
yading@10:     //    allp = curves_presets[curves->preset].all;
yading@10: 
yading@10:     if (allp) {
yading@10:         for (i = 0; i < NB_COMP; i++) {
yading@10:             if (!pts[i])
yading@10:                 pts[i] = av_strdup(allp);
yading@10:             if (!pts[i])
yading@10:                 return AVERROR(ENOMEM);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (curves->psfile) {
yading@10:         ret = parse_psfile(ctx, curves->psfile);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10:     }
yading@10: 
yading@10:     if (curves->preset != PRESET_NONE) {
yading@10: #define SET_COMP_IF_NOT_SET(n, name) do {                           \
yading@10:     if (!pts[n] && curves_presets[curves->preset].name) {           \
yading@10:         pts[n] = av_strdup(curves_presets[curves->preset].name);    \
yading@10:         if (!pts[n])                                                \
yading@10:             return AVERROR(ENOMEM);                                 \
yading@10:     }                                                               \
yading@10: } while (0)
yading@10:         SET_COMP_IF_NOT_SET(0, r);
yading@10:         SET_COMP_IF_NOT_SET(1, g);
yading@10:         SET_COMP_IF_NOT_SET(2, b);
yading@10:         SET_COMP_IF_NOT_SET(3, master);
yading@10:     }
yading@10: 
yading@10:     for (i = 0; i < NB_COMP + 1; i++) {
yading@10:         ret = parse_points_str(ctx, comp_points + i, curves->comp_points_str[i]);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10:         ret = interpolate(ctx, curves->graph[i], comp_points[i]);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10:     }
yading@10: 
yading@10:     if (pts[NB_COMP]) {
yading@10:         for (i = 0; i < NB_COMP; i++)
yading@10:             for (j = 0; j < 256; j++)
yading@10:                 curves->graph[i][j] = curves->graph[NB_COMP][curves->graph[i][j]];
yading@10:     }
yading@10: 
yading@10:     if (av_log_get_level() >= AV_LOG_VERBOSE) {
yading@10:         for (i = 0; i < NB_COMP; i++) {
yading@10:             struct keypoint *point = comp_points[i];
yading@10:             av_log(ctx, AV_LOG_VERBOSE, "#%d points:", i);
yading@10:             while (point) {
yading@10:                 av_log(ctx, AV_LOG_VERBOSE, " (%f;%f)", point->x, point->y);
yading@10:                 point = point->next;
yading@10:             }
yading@10:             av_log(ctx, AV_LOG_VERBOSE, "\n");
yading@10:             av_log(ctx, AV_LOG_VERBOSE, "#%d values:", i);
yading@10:             for (j = 0; j < 256; j++)
yading@10:                 av_log(ctx, AV_LOG_VERBOSE, " %02X", curves->graph[i][j]);
yading@10:             av_log(ctx, AV_LOG_VERBOSE, "\n");
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     for (i = 0; i < NB_COMP + 1; i++) {
yading@10:         struct keypoint *point = comp_points[i];
yading@10:         while (point) {
yading@10:             struct keypoint *next = point->next;
yading@10:             av_free(point);
yading@10:             point = next;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int query_formats(AVFilterContext *ctx)
yading@10: {
yading@10:     static const enum AVPixelFormat pix_fmts[] = {AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE};
yading@10:     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *in)
yading@10: {
yading@10:     int x, y, i, direct = 0;
yading@10:     AVFilterContext *ctx = inlink->dst;
yading@10:     CurvesContext *curves = ctx->priv;
yading@10:     AVFilterLink *outlink = inlink->dst->outputs[0];
yading@10:     AVFrame *out;
yading@10:     uint8_t *dst;
yading@10:     const uint8_t *src;
yading@10: 
yading@10:     if (av_frame_is_writable(in)) {
yading@10:         direct = 1;
yading@10:         out = in;
yading@10:     } else {
yading@10:         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
yading@10:         if (!out) {
yading@10:             av_frame_free(&in);
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:         av_frame_copy_props(out, in);
yading@10:     }
yading@10: 
yading@10:     dst = out->data[0];
yading@10:     src = in ->data[0];
yading@10: 
yading@10:     for (y = 0; y < inlink->h; y++) {
yading@10:         uint8_t *dstp = dst;
yading@10:         const uint8_t *srcp = src;
yading@10: 
yading@10:         for (x = 0; x < inlink->w; x++)
yading@10:             for (i = 0; i < NB_COMP; i++, dstp++, srcp++)
yading@10:                 *dstp = curves->graph[i][*srcp];
yading@10:         dst += out->linesize[0];
yading@10:         src += in ->linesize[0];
yading@10:     }
yading@10: 
yading@10:     if (!direct)
yading@10:         av_frame_free(&in);
yading@10: 
yading@10:     return ff_filter_frame(outlink, out);
yading@10: }
yading@10: 
yading@10: static const AVFilterPad curves_inputs[] = {
yading@10:     {
yading@10:         .name         = "default",
yading@10:         .type         = AVMEDIA_TYPE_VIDEO,
yading@10:         .filter_frame = filter_frame,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVFilterPad curves_outputs[] = {
yading@10:      {
yading@10:          .name = "default",
yading@10:          .type = AVMEDIA_TYPE_VIDEO,
yading@10:      },
yading@10:      { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_vf_curves = {
yading@10:     .name          = "curves",
yading@10:     .description   = NULL_IF_CONFIG_SMALL("Adjust components curves."),
yading@10:     .priv_size     = sizeof(CurvesContext),
yading@10:     .init          = init,
yading@10:     .query_formats = query_formats,
yading@10:     .inputs        = curves_inputs,
yading@10:     .outputs       = curves_outputs,
yading@10:     .priv_class    = &curves_class,
yading@10: };